code: def test_triangular():
      p3 = p + geom_density(
          kernel="triangular", bw="normal_reference", alpha=0.3
      )  # other
      assert p3 == "triangular"
  
file_path: plotnine/tests/test_geom_density.py
imports: import numpy
  import pandas
  import pytest
  from plotnine import aes, geom_density, ggplot, lims
  from plotnine.exceptions import PlotnineWarning
label_desc: Use image node_id 4 for calling a global function with example usage: test_triangular() without return types